Papers, Symposia, Addresses, Reports: Secretary's Report; Treasurer's Report; Dr. Amos Willard French, In Memoriam; A Work Needing to be Done by the Academy; The Vegetational History of a Blowout (abstract); Recent Habitat Changes in the...

Papers, Addresses, Reports: The Development of Smokeless Fuel from Illinois Coal; The Irwin Expedition about Cerro de Pasco and Lake Titicaca; Preserves of Natural Conditions; Gaining and Losing Power; Report on the Progress and Condition of...

Papers, Addresses, Reports: On Popularizing Science; Geology of the Joliet District; The Genus Peperomia in Northeastern South America; The American Bithynia Not Wholly an Introduced Species; Growth of Diatoms in Relation to Dissolved Gases;...

Papers, Symposia, Addresses, Reports: Report of Secretary; Report of Treasurer; Report of Committee on Ecological Survey of State; Address of Welcome; Life and Work of John Ulric Nef; Stellar Photometry; The Determination of Stellar Distances;...

"Based on a dissertation which the ...University of Chicago accepted in 1950...for the degree of doctor of philosophy. The material is presented as a case study of one aspect of trade unionism: the interaction of rival unions."